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Sequences and Series

Section: Mathematics

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Question : 1

Total: 22

Let 7⏞5...57r denote the (r+2) digit number where the first and the last digits are 7 and the remaining r digits are 5. Consider the sum S=77+757+7557+...+7⏞5...5798.If S=‌

, where m and n are natural numbers less than 3000 , then the value of m+n is

[JEE Adv 2023 P1]

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